Hi again!
I was able to fix the issue.
To sum it up, we use BC in the cloud, not on-premise, and we updated our instance to version 24. After the update, when we tried to open the Shopify Shops list, we got the error to refresh the access token, but if you know the Shopify connector, you know that to refresh the token, you have to access the shops list and the shop-card🙃
So, I was able to resolve the error, by going to Extension Management and find the Shopify Connector, then selected "Setup" by pressing the 3-dots. I went through the setup wizard and entered the same shop URL as the one I already have (but could not access), authenticated the connection and then I was able to access the Shopify Shops list again!😁
It creates a new "Shop" in BC, but I just disabled that one and deleted it, and then I did a manual access token refresh on the original Shop.
I hope this helps anyone that encounters the same or similar issue.
And thank to other people that replied.
Kind regards
Jesper F