This has been going on for several months, and I only recent heard of this bug tracker.
I play mainly on my Nintendo Switch, but I have a friend on iPad who cannot join anyone’s games, and no one can join his games. I have another friend on Xbox who cannot join me, but I believe I can join him, and he and I can both join other people’s worlds. It is not the Microsoft account parental settings, as we were all able to play together fine a long time ago, and we have checked our settings multiple times since this issue started. I have attached a screenshot from my Switch attempting to join the iPad.
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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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The workaround listed on MCPE-36190 would not correlate to my issue. The problem persists even when I take my Nintendo Switch or when my friend takes his iPad to each others' houses and multiple other places where we take our devices, even at locations where they worked before.