MacOS Client custom Port number failure

I have tried to swap to the new Nextcloud MacOS Client from the old Owncloud client.

In the own cloud client it is possible to add a custom port number to the end of a url i.e.

However, with the new Nexctcloud client, when a custom port number is added it errors and with a not found error straight away. If I remove the custom port it tries for a while before failing.

It seems as though the custom port stops the client proceeding.

Any ideas?

Closing this as issue is not due to port, but is due to some other connection issue as referred in Mac client can't connect - Connection closed