Boot won’t open

[JonJ90]

Can anyone help point me in the right direction? Audi A3 Saloon (2015)
 

My boot won’t open. I firstly couldn’t open it as normal, but only using my key fob, which now also won’t work! (I know I should have got it looked at/looked into it sooner).

I think it might be electrical as I have climbed in the boot, and found the release hatch in there and used my key to manually open this. 
 

Any ideas/solutions very welcome 

[Steve Q]

I'd recommend a diagnostic check to see if any fault codes flag up. 

Have you tried the spare key? I ask as that can help narrow down the issue. If both keys are working then the key isn't the culprit.