Roaming not working internationally

Hello. I am currently abroad in Poland and having difficulty with roaming on iPhone 13 despite having global pass activated and having 4 bar signal. The phone does connect to local carriers but does not display 4g/5g/LTE. I have tried:

- restarting

- hard restarting

- network reset

- toggle airplane mode

- toggle roaming

- ensuring no VPN

- software update

- updating carrier settings

- manually selecting network from the options listed.

I appreciate the help