Passman 2.2.1 - Nextcloud upgrade from 15.0.2 to 15.0.4 - Certificate is not valid

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Hello
I get a Passman certificate issue. details below.
How can I solve it ?
Thanks.

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Nextcloud version: 15.0.4
Operating system and version : Ubuntu 16.04.5 LTS
Apache or nginx version : Apache/2.4.18 (Ubuntu)
PHP version :PHP 7.2.14-1+ubuntu16.04.1+deb.sury.org+1 (cli) (built: Jan 13 2019 10:05:18)

The issue you are facing:

  • passman
    • EXCEPTION
      • OC\IntegrityCheck\Exceptions\InvalidSignatureException
      • Certificate is not valid.
        Raw output
        ==========
        Array
        [passman] => Array
        [EXCEPTION] => Array
        [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
        [message] => Certificate is not valid.

Known issue. https://github.com/nextcloud/passman/issues/524

More annoying, that even with disabling and removing the app, you can’t get rid of the error!
Update: After remove and several rescans, the error is gone.

I disabled Passman, then removed.
Rescan said ok
and finally reinstalled Passman 2.2.1.
It works without any new issue.