Subscription pop up blocking access to my boards

[Anja]

A month ago the support removed the 14 day Premium Trial so that I am on the Free scheme.  That has worked fine. 
A few days ago a Pop up window stating Premium trial ended subscribe with payment option is appearing when i click to open a board. I cannot close it nor access my boards:
I was told by support last month that I can remain on Free scheme as long as I want:

Now I cannot access my work. 
I have emailed support but did not receive a ticket confirmation of my query.
Can someone advise me please how to remove pop up ?
Thanks in advance

[Kristian Walker _Adaptavist_]

Hi Anja,

I have clicked the request assistance button to notify Atlassian Support of this request so they can look to answer this question for yourself.

Regards,

Kristian

[Oleksandr]

Hi Anja!

Could you share a screenshot of how that pop-up looks?

Sometimes there is a very tiny, non-obvious link or button (like "Stay on Free" or a small "x" in a corner) that you need to click to dismiss it. Also, keep in mind that if your Workspace has more than 10 collaborators, Trello might be blocking access until the "over-limit" issue is resolved, which often looks like a forced subscription prompt.

Showing us the window would help us figure out if there's a way to bypass it!