Hi Hanna,
Thanks for the response – our issue has always only been in Safari. Our developer investigated further using the the new URL format you provided and our original test steps. He responded with:
“If I clear cookies, go back and try exactly the same steps it fails.”
Further, he performed the test in a private browsing windows and reports:
"I was able to get past the Enable cookies screen once, but the problem reappears.
"To clarify, a full cycle with login to the store and installation using the /auth/inline form of the URL works in a Safari private window, but not in a regular one, regardless of whether I clear all my Shopify and STAGE TEN cookies or not. I have no extensions/ad blockers etc running in Safari.
“Having installed the app successfully in the private window, if I then attempt to access it from a regular Safari window I get the same ‘enable cookies’ loop.”
I hope this additional information helps.