I have a BA Executive Club account and was trying to open an Iberia account. But I faced some issues, and it is also a challenge with the different language.
When I try to enter my date of birth it automatically changes the date to 1 when I enter the month. I need a valid date of birth as I want it to match my BA information.
Apologies if I have misunderstood you, but it appears that:
1. you are unaware that the IB+ website can be accessed in English - use the dropdown box with the country setting
2. you are unaware that in Europe, dates are done as DAY, MONTH, YEAR. i.e. today would be 24/01/2021. The system will default if you try to enter something incorrect, such as a month "24" or text such as "JAN".