When I had DD1 abroad 20+ years ago UK - expat passports were issued by the British Embassy.
I therefore went to the British Embassy and paid £200 to have her added to my passport and Registered in the UK. I was sent a Birth Certificate for an overseas birth by the Embassy.
As a result of Brexit DD has applied for her first adult passports but these are now processed in the UK. However the passport office is saying that the Embassy Birth Certificate that the British Government charged me for is not recognised - even though it was recognised when she was a child.
Does anyone have any experience of this?