Unfortunately, not sure. You can try reinstalling, resetting, clearing out space, but otherwise, it just might not work on your device.
I'll try that then get back to you with the results at least if we can conclude that it is my device then at least in future it'll be known of possible issues with OPPO phones, if it's not just my phone on it's own it is second hand after all
Hopefully I can get it working
I did the troubleshooting you suggested and no change so it's an issue with my phone, unfortunate but it is what it is I suppose