Reinstalling the app won’t make a difference if there’s a problem with the remote access setup.
To pin down what’s causing this for you I recommend you have a look at the related troubleshooting guide and share your findings.
A VPN will certainly make this more complicated.
@asafa63 : did you reclaim your server after resetting your password? If the server is signed out you won’t be able to see it from outside your home network.
