Jacob, please make sure that you have an SSL certificate in place, coming from a certified authority. A self-signed certificate is not tolerated by mobile applications.
The most recent Mobile CRM Installation Guide I have is from Kinetic 2021.2, and just now looking on EpicWeb I don’t find a newer one. If you can get to EpicWeb and download that (go to Documentation > On-Prem (might be on Cloud too but didn’t check) and scroll back in time until you come to 2021.2 (with no patch revision). Look under Installation Guides for “MobileCRM_InstallGuide_Kinetic 2021.2”.
I might have a nugget or two that either solves the problem or tells you where to look.
That’s the guide I followed. Not find anything that I haven’t done correctly. Alexandre did point out self-signed certs won’t work, which is what we’re using currently.