****UPDATE!!***. Yes!!  Adding an extention to the warehouse name on shopify side in the location settings for shopify has fixed the shopify tik tok app error for locations and now I can see my products etc.  

hey mate, i think i may have found something thats working for me so far as to say ive finally got rid of the error after many many days probably like yourself.  One thing i did was to add POD warehouse to tik tok warehouse backend, but weirdly that ...