When inputting a Tipee URL that begins with a language-related subdomain, i.e...

https://en.tipeee.com/borisdalstein

...the URL is not recognised as tipeee. This is the case with all 5 languages that the Tipee website supports: en, it, fr, de & es.

Edit: To clarify, this happens when inputting the URL to the External Links box when editing an entity.