Fixed with a reset of the WiFi and Bluetooth settings / step 10 here
https://techwiser.com/fix-android-connected-to-wifi-but-no-internet/
... which switched my dns setting on my mobile data back to auto. When I toggled it back, then the WiFi stopped working again.
So what are your dns settings? Hardcoded to your home router IP or something?
@duncs started
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Fixed with a reset of the WiFi and Bluetooth settings / step 10 here
https://techwiser.com/fix-android-connected-to-wifi-but-no-internet/
... which switched my dns setting on my mobile data back to auto. When I toggled it back, then the WiFi stopped working again.