Wireless Charging Capability

I have a 2019 Cadillac XT5 and I’m having difficulty charging my iPhone 8 Plus using its wireless charging capabilities.
When I slide the phone into the console’s dedicated slot, the charging icon (⚡️) appears on the electronic screen on the dash, indicating that the phone is charging, however, the phone’s battery symbol (⚡️) goes on and off. I’ve tried reversing the phone in the charging port but to no avail.
My previous XT7 (2017) worked flawlessly, but couldn’t handle the larger (plus) models. Has anyone else experienced this problem? How did you remedy it? Thanks.

Wallace