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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:
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Nextcloud version (eg, 20.0.5): latest' Operating system and version _(eg, Ubuntu 20.04)_: ubuntu server 23.04Apache or nginx version _(eg, Apache 2.4.25)_: unknownPHP version _(eg, 7.4)_:latest`
The issue you are facing:
just curious if anyone has had luck connecting their servers on the desktop app when running nextcloud through a cloudflare tunnel. i am currently doing so, on a proxmox lxc running dockerized nextcloud. i have a cloudflare tunnel in place and that is all working fine. however when i try to connect desktop app to the server i get various errors, one about a certificate that can’t be trusted, but when clicking to trust it anyway, the connection fails anyway. i’m not super knowledgeable on how all this works. when i type in the local ip of the server that works fine and it redirects me to a page to login to grant access. i assume this will be the same on the mobile app. so if anyone has a similar config and knows how to make this work, i’m all ears.
i tried playing with the tunnel settings, no tls verify, https2, none of that seems to make a difference, so i’m thinking it’s not the tunnel itself? but i don’t know.
Is this the first time you’ve seen this error? (Y/N):
Steps to replicate it:
The output of your Nextcloud log in Admin > Logging:
PASTE HERE
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
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