[Bug]: Login stuck – nextcloud app on iphone

[amgschnappi]

⚠️ This issue respects the following points: ⚠️

• [X] This is a bug, not a question or a configuration/webserver/proxy issue.
• [X] This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• [X] Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• [X] I agree to follow Nextcloud's Code of Conduct.

Bug description

Unable to login to nextcloud app on iphone. Login is stuck. But on same iphone I can use firefox and connect and login to https://subdomain.domain.com/

Steps to reproduce

1. Install nextcloud app on android and iphone
2. Try to connect to my https://subdomain.domain.com/ via both phones

Login from android works Login from iphone is stuck at rotating gear icon

Expected behavior

Login from iphone should work

Installation method

Community Docker image

Nextcloud Server version

27

Operating system

Other

PHP engine version

None

Web server

None

Database engine version

None

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• [X] Default user-backend (database)
• [ ] LDAP/ Active Directory
• [ ] SSO - SAML
• [ ] Other

Configuration report

No response

List of activated Apps

No response

Nextcloud Signing status

No response

Nextcloud Logs

No response

Additional info

No response