Which characters are allowed for network connection?

[Sk4y]

Hey together.
Flashed Valetudo 2021.04.0 lowmem on my S5 Max and till now everything is working fine.
Nevertheless i wanted to change the Wifi Settings (SSID and psk) on the robo and it doesnt work either through Valetudo or manual with the wifi.conf.
Usually my passwords are autogenerated passwords with symbols like ",'#/* etc. and ive read in an issue that it could be a problem with them. If its the case which symbols are allowed because i didnt find docs about it or is it even an other problem?

Once already thanks for your help :)

PS: I narrowed it down to a symbol problem. So the question is now which symbols or characters are/aren't allowed.