It's a problem with DHCP in the iOS.
After connecting to the hotspot, open a command prompt window ("black box" = cmd.exe program) on the PC and run this command (type it after the C:\users\yourname> then hit enter)
ipconfig /all
Find the chunk of info that belongs to your wireless adapter
You will note that probably the IPv4 address given there is the one that you use for your office or home network, and that gateway is empty. It's normal that the PC will try and maintain the same IP address for you "hi, this is my IP I want to use", but the DHCP server on a different network (unless it coincidentally has the same configuration and that IP is not in use by another user) should reply back with "sorry, I can't let you use that IP, here's another one". That is not happening in this case - something broke this communication in v 13
To fix, now run each of these commands, hitting enter after typing each one:
ipconfig /release
ipconfig /renew
What this does it make Windows NOT attempt to reuse the same IP, and instead start the conversation with "hi, can I have an IP?" to which the DHCP server will dutifully give you a new one in the correct subnet.
For example, in our case, the PC wanted to reuse 192.168.2.109 and the DHCP service on the phones gives IPs in 172.20.10.x
If this helps you, I would appreciate if you can post back to answer MY questions about this?
- ipad or iphone and what IP range did you get (I am wanting to know if 172.20.10.x is same on all ?)
- how long is the lease ? (after connection succeeded, do ipconfig /all and look at the lease obtained/expired times)
- is it a one-time fix or you have to release/renew again if you connected back to office/home wifi then to phone hotspot again ?