Hi! Which URL did you put in your Joplin-Client Configuration?
EDIT:
I think, you might have done the same mistake I did at the beginning...take a look at Failing to install HTTPS on Joplin Server and let me know, if that fixes your problems 
Hi! Which URL did you put in your Joplin-Client Configuration?
EDIT:
I think, you might have done the same mistake I did at the beginning...take a look at Failing to install HTTPS on Joplin Server and let me know, if that fixes your problems