The form very clearly asks about all your nationalities/citizenships you hold so yes you must declare all. If you are approved and become British, you will also have to submit both nationality passports when you apply for a British passport. How does that work if I do not have a passport or valid I...

Thanks a lot for your response. Do I need to correct the information about dual nationality for my Settled Status prior to applying to UK citizenship ?

Hello, I am European citizen applying for British citizenship this year as received Settled Status last year. I have been European citizen for 25 years by naturalisation but have an another nationality by birth from an African country. Both countries allow dual citizenship. I have never been to that...