Hi, I am having the same problem since ios 15 update. Recently I believed I have found a solution. Just like the requirement to do an iCloud backup, the phone MUST be connected to a wifi network, charging and screen turned off overnight. After that I found the significant location getting updated everyday. I currently do not have wifi, just tethering from another phone. If I disable wifi tethering overnight, then significant location won’t be updated the next morning. So I wonder if the problem is caused by no wifi connection to update significant location.
Southwind7
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