[Bug]: Caldav not working on osx

⚠️ This issue respects the following points: ⚠️

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

Bug description

Constantly getting the same error: Your calendar couldn’t be refreshed. The request for account “ADDRESS” failed.

Steps to reproduce

Step up nextcloud with SSO
Create an app password
Navigate to the calendar app and click on "Copy iOS/macOS CalDAV address"
Go to the default calendar app in OSX and choose add Caldav account
Fill in the user, username and password from step 2

Expected behavior

Calendar events showing up on local computer

Installation method

Official All-in-One appliance

Nextcloud Server version

29

Operating system

Debian/Ubuntu

PHP engine version

None

Web server

None

Database engine version

None

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

Fresh Nextcloud Server install

Are you using the Nextcloud Server Encryption module?

Encryption is Enabled

What user-backends are you using?

• 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

All steps from the guide were followed. Https, no self-signed certificates, .well-known/caldav, etc.

Reproduce the failure using the listed Nextcloud 29 All-in-One, SAML SSO, app-password, and macOS CalDAV steps. Start by collecting the missing Nextcloud logs and configuration report, then trace the CalDAV request and authentication response; done means calendar events appear in the macOS Calendar app without the refresh error.