Shadowlands problems with company

Task: Step into the circle of light
Campaign: Chains of Domination (Shadowlands)
Zone: Bastion

When tapping on the Soul Mirror to enter Uther’s vision, the player is not transported to Stratholme. Instead, an error message appears after the download screen (without showing the download progress).:
“You don’t meet the requirements for the selected dungeons.
The transfer was interrupted: the instance was not found.”

Re-logging did not help. Logging into the game, changing the location, and restarting the interface with disabling addons too

There are various comments about this on Wowhead

including

If it says you cannot enter instance, leave Chromie time. This fixed it for me.

and

If you tried everything and you are still getting disconnected, check if Gift of Thenios is around. After I opened the chest I could complete the quest.

Does anything there make sense ti your case, or help?