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Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
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): 27.1.1
Operating system and version (eg, Ubuntu 20.04): Ubuntu 22.04.3 LTS
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.52
PHP version (eg, 7.4): '8.1.2-1ubuntu2.14`
The issue you are facing: I have updated two of my Nextcloud servers from 27.0 to 27.1 and in both cases I can no longer open an Office file using the official Android app. I get an error saying ‘No app set up to handle this file type’.
I can still do so through a browser or from the official iOS Nextcloud app. Identical servers still running 27.0 continue to work with the Android app. All servers are using the same external Collabora instance as the Office back end.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Use the Android Nextcloud client to open an Office file residing on a NC 27.0 server, such as an odt or ods file.View and edit it as desired.
- Update the server to 27.1
- Attempt to repeat step 1 and observe the error message in place of a successful operation.
The output of your Nextcloud log in Admin > Logging:
Nothing is logged either when attempting to open a file from the Android app, or when successfully opening the same file from the iOS app.
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'passwordsalt' => 'hidden',
'secret' => 'hidden',
'trusted_domains' =>
array (
0 => 'localhost',
1 => 'hidden',
),
'datadirectory' => '/usr/local/ncdata',
'dbtype' => 'mysql',
'version' => '27.1.1.0',
'overwrite.cli.url' => 'hidden',
'dbname' => 'nextcloudDB',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'hidden',
'dbpassword' => 'hidden',
'installed' => true,
'instanceid' => 'hidden',
'htaccess.RewriteBase' => '/',
'overwriteprotocol' => 'https',
'force_language' => 'en',
'force_locale' => 'en_US',
'default_phone_region' => 'US',
'auth.bruteforce.protection.enabled' => true,
'filelocking.enabled' => true,
'memcache.local' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '127.0.0.1',
'port' => 6379,
'timeout' => 0,
),
'mail_smtpmode' => 'smtp',
'mail_sendmailmode' => 'smtp',
'mail_domain' => 'hidden',
'mail_smtpsecure' => 'tls',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtpport' => '587',
'mail_smtphost' => 'hidden',
'mail_smtpname' => 'hidden',
'mail_smtppassword' => 'hidden',
'mail_from_address' => 'device',
'remember_login_cookie_lifetime' => 259200,
'session_lifetime' => 43200,
'auto_logout' => true,
'token_auth_enforced' => true,
'skeletondirectory' => '',
'trusted_proxies' =>
array (
0 => 'hidden',
),
'twofactor_enforced' => 'true',
'twofactor_enforced_groups' =>
array (
),
'twofactor_enforced_excluded_groups' =>
array (
),
'preview_max_memory' => 4096,
'preview_max_filesize_image' => 256,
'maintenance' => false,
'preview_max_x' => 100,
'preview_max_y' => 100,
'preview_max_scale_factor' => 1,
'allow_local_remote_servers' => true,
'loglevel' => 1,
'theme' => '',
'updater.release.channel' => 'stable',
'session_keepalive' => false,
'memories.exiftool' => '/var/www/nextcloud/apps/memories/exiftool-bin/exiftool-amd64-glibc',
'memories.vod.path' => '/var/www/nextcloud/apps/memories/exiftool-bin/go-vod-amd64',
);
The output of your Apache/nginx/system log in /var/log/____:
[Tue Sep 26 00:00:01.392448 2023] [mpm_prefork:notice] [pid 352] AH00163: Apache/2.4.52 (Ubuntu) OpenSSL/3.0.2 configured -- resuming normal operations
[Tue Sep 26 00:00:01.392497 2023] [core:notice] [pid 352] AH00094: Command line: '/usr/sbin/apache2'
PASTE HERE
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
PASTE HERE