That's so strange.. I can only think about some options on the phone that doesn't allow you to install "not secure" app from browser.. but if you have already done it before from github, I have no clue 🥲
Discussion
In the meantime, thank you very much, you were kind enough to support me, most likely it's as you say ... unfortunately I'm not a technician and I don't know what to do. 🫂🧡💜