I'm having the same issue. I successfully connect to a family member's ipad with the live broadcast feature of iOS to TeamViewer. It works for a few moments, then disconnects due to null. The person controlling the iPad did nothing more than try to press home and open Safari. We did not test enough to see what other activities caused it as it was too frustrating to set it all up each time to only disconnect within 30 seconds or less. Any idea if this is a known bug?
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