@Xochitl Welcome to the forum!
Regarding Wi-Fi, also a restart of the router can help. (–> if it were IP related problems, the router restart gets you a fresh IP address)
On your iPhone, also deactivate “smart punctuation”, as this can change your master password input.
If you are still interested in troubleshooting, here is a whole list of things you can still also try: [Guide] "I can't login" - Some tips for login problems/issues