My phone just did an OTA update to latest version (Security Patch from Oct 05, 2020).
I also changed my carrier and decided to test hotspot: well, as soon as I turn it on it turns off, in other words it does not stay on.
I tested new carrier with another phone and hotspot is working fine.
Any help/ideas? Thanks!
Edit: after getting out of Wi-Fi hotspot I noticed written "Error" under.