Unable to connect to TeamViewer with my Iphone

I'm unnable to connect to TeamViewer with my Iphone.

When I try I get:

Unable to connect; A connection could no be established. Reason unknown.

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thanks for posting in the Community! Welcome

Please see following checks:

Is your internet connection working? (Both a local device and a endpoint device.)
Can you check if restarting the TeamViewer service helps for both of devices?

Please find the current status

Best, Alena