If the tick delay for command blocks is high the block won't execute the command. I've managed to get it to work at 10 tick delay but any higher and it doesn't work. Only own the ps version so I'm not sure if its affect other platforms.
Linked issues
duplicates 1
Comments 2
Thank you for your report!
We're tracking this issue in MCPE-145283, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Your bug report currently is a duplicate of a bug report that a user has made in the past.
https://bugs.mojang.com/browse/MCPE-145283
Please look at the bug report above as it is more detailed. You can check the bug report above from time to time if you are keen for it to be fixed.