My niece and I play together side by side, and up until recently there have been no issues. but the last three times i've tried to get them to connect, it has continually been unable to connect.
Both devices have minecraft updated to 1.17.34.
I deleted and redownloaded on my niece's device but this made no change.
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It says the standard βcould not connect to worldβ after its tried

Thank you for your report!
We're tracking this issue in MCPE-36190, so this ticket is being resolved and linked as a duplicate.
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Do you get any error messages?