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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): latest
Operating system and version (eg, Ubuntu 20.04): 20.04
Apache or nginx version (eg, Apache 2.4.25): latest nginx
PHP version (eg, 7.4): 7.4
The issue you are facing:
Unable to disable the encryption notifications after each login.
Is this the first time you’ve seen this error? (Y/N): N
Steps to replicate it:
- Login to my account
- Il get a notification that my encryption is disabled and I need to enable it
- Invalid private key for encryption app. Please update your private key password in your personal settings to recover access to your encrypted files.
The output of your Nextcloud log in Admin > Logging:
{"reqId":"rHvaqBGr5IosaasUzOrg","level":2,"time":"2021-10-18T18:51:59+00:00","remoteAddr":"86.49.250.153","user":"cosmic","app":"encryption","method":"POST","url":"/index.php/login/webauthn/finish","message":"Could not decrypt the private key from user \"cosmic\"\" during login. Assume password change on the user back-end.","userAgent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.4 Safari/605.1.15","version":"22.2.0.2","exception":{"Exception":"OCP\\Encryption\\Exceptions\\GenericEncryptionException","Message":"Bad Signature","Code":0,"Trace":[{"file":"/snap/nextcloud/28586/htdocs/apps/encryption/lib/Crypto/Crypt.php","line":470,"function":"checkSignature","class":"OCA\\Encryption\\Crypto\\Crypt","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/snap/nextcloud/28586/htdocs/apps/encryption/lib/Crypto/Crypt.php","line":419,"function":"symmetricDecryptFileContent","class":"OCA\\Encryption\\Crypto\\Crypt","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/snap/nextcloud/28586/htdocs/apps/encryption/lib/KeyManager.php","line":403,"function":"decryptPrivateKey","class":"OCA\\Encryption\\Crypto\\Crypt","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/snap/nextcloud/28586/htdocs/apps/encryption/lib/Hooks/UserHooks.php","line":182,"function":"init","class":"OCA\\Encryption\\KeyManager","type":"->"},{"file":"/snap/nextcloud/28586/htdocs/lib/private/legacy/OC_Hook.php","line":106,"function":"login","class":"OCA\\Encryption\\Hooks\\UserHooks","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/snap/nextcloud/28586/htdocs/lib/private/Server.php","line":586,"function":"emit","class":"OC_Hook","type":"::"},{"function":"OC\\{closure}","class":"OC\\Server","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/snap/nextcloud/28586/htdocs/lib/private/Hooks/EmitterTrait.php","line":106,"function":"call_user_func_array"},{"file":"/snap/nextcloud/28586/htdocs/lib/private/Hooks/PublicEmitter.php","line":40,"function":"emit","class":"OC\\Hooks\\BasicEmitter","type":"->"},{"file":"/snap/nextcloud/28586/htdocs/lib/private/User/Session.php","line":411,"function":"emit","class":"OC\\Hooks\\PublicEmitter","type":"->"},{"file":"/snap/nextcloud/28586/htdocs/lib/private/Authentication/Login/CompleteLoginCommand.php","line":44,"function":"completeLogin","class":"OC\\User\\Session","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/snap/nextcloud/28586/htdocs/lib/private/Authentication/Login/ALoginCommand.php","line":40,"function":"process","class":"OC\\Authentication\\Login\\CompleteLoginCommand","type":"->"},{"file":"/snap/nextcloud/28586/htdocs/lib/private/Authentication/Login/LoggedInCheckCommand.php","line":60,"function":"processNextOrFinishSuccessfully","class":"OC\\Authentication\\Login\\ALoginCommand","type":"->"},{"file":"/snap/nextcloud/28586/htdocs/lib/private/Authentication/Login/ALoginCommand.php","line":40,"function":"process","class":"OC\\Authentication\\Login\\LoggedInCheckCommand","type":"->"},{"file":"/snap/nextcloud/28586/htdocs/lib/private/Authentication/Login/WebAuthnLoginCommand.php","line":46,"function":"processNextOrFinishSuccessfully","class":"OC\\Authentication\\Login\\ALoginCommand","type":"->"},{"file":"/snap/nextcloud/28586/htdocs/lib/private/Authentication/Login/ALoginCommand.php","line":40,"function":"process","class":"OC\\Authentication\\Login\\WebAuthnLoginCommand","type":"->"},{"file":"/snap/nextcloud/28586/htdocs/lib/private/Authentication/Login/UserDisabledCheckCommand.php","line":58,"function":"processNextOrFinishSuccessfully","class":"OC\\Authentication\\Login\\ALoginCommand","type":"->"},{"file":"/snap/nextcloud/28586/htdocs/lib/private/Authentication/Login/WebAuthnChain.php","line":95,"function":"process","class":"OC\\Authentication\\Login\\UserDisabledCheckCommand","type":"->"},{"file":"/snap/nextcloud/28586/htdocs/core/Controller/WebAuthnController.php","line":114,"function":"process","class":"OC\\Authentication\\Login\\WebAuthnChain","type":"->"},{"file":"/snap/nextcloud/28586/htdocs/lib/private/AppFramework/Http/Dispatcher.php","line":217,"function":"finishAuthentication","class":"OC\\Core\\Controller\\WebAuthnController","type":"->"},{"file":"/snap/nextcloud/28586/htdocs/lib/private/AppFramework/Http/Dispatcher.php","line":126,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/snap/nextcloud/28586/htdocs/lib/private/AppFramework/App.php","line":156,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/snap/nextcloud/28586/htdocs/lib/private/Route/Router.php","line":301,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/snap/nextcloud/28586/htdocs/lib/base.php","line":1000,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/snap/nextcloud/28586/htdocs/index.php","line":36,"function":"handleRequest","class":"OC","type":"::"}],"File":"/snap/nextcloud/28586/htdocs/apps/encryption/lib/Crypto/Crypt.php","Line":495,"Hint":"Bad Signature","CustomMessage":"Could not decrypt the private key from user \"cosmic\"\" during login. Assume password change on the user back-end."},"id":"616dc46515854"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
PASTE HERE
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE