change email (email is invalid)

Hello folks :-)

I've a primary account (using email1) and a secondary account that I removed completely (using email2)

I deleted that account using this howto:

https://support.garmin.com/en-GB/?faq=HB1akRE1Fe4uKuYhSmhON8

even though account were deleted, on primary account I cannot change email with email that I used with secondary account, message is: invalid email

any idea to solve this problem?

thanks