After tapping the One tap mobile link on the invite when joining a Zoom meeting by phone, the call will fail and eventually disconnect.
iPhone, iPad
Update your iPhone or iPad
https://support.apple.com/en-us/118575
As a workaround, join on the Zoom Workplace mobile app.
https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0060732#h_01FNVYW0C2Q9DCJ8JVJ03BZJ0V