I recently moved house and have had a new router installed in the house which is working fine for all my devices until recently my MacBook Pro 2013 started to have trouble connecting. Ultimately my whole MacBook Pro started playing up but it turned out this was because I was running unofficial macOS (Big Sur) on my old 2013 model.
I did a fresh install back to Catalina but this Wi-Fi issue still persisted. What's odd though is that it seems to only have trouble connecting to this network. Other networks or hot spotting to my phone works fine so fortunately its not a hardware issue.
Each time I click to connect I'm asked for the password and after I enter this hangs about trying to connect for a bit and then says connection failed and I have to restart the whole process again (to no avail). Interestingly, if I enter the wrong password the same thing happens and It doesn't tell me the password is incorrect.
Something more fundamental is going wrong I think. Does anyone have any thoughts on how I can go about troubleshooting this issue? I have restarted multiple times, and reset the PRAM, NVRAM etc but no changes.