I just received the acknowledgement letter asking for two specific things

1.- Prove my girlfriend and I have been in a durable relationship (we sent pictures, a letter from our landlord and a friend, receipts from holidays, our payments book rent with both our names on it) but it seems that is not enough. They are asking for jointly-owned assets or shared bank accounts or insurance but we don't have those so we don't know what to do in this case
2.- My girlfriend and I met during covid times so they are asking for a justification of how we met when there were restrictions level 5 (I remember at that time people were going to parks and stuff) and my house was 5.9km far from where we met.
Have you been asked the same or similar questions? Do you know what I could do?
I'll appreciate your help
