Hide My Email service — buggy
It appears that using this feature, designed to protect your email address from apps requiring sign-ins, is more troublesome and creates more problems than the benefits it offers.
For instance, today I noticed I was logged out of a laundry app and attempted to log back in. However, my iPhone did not prompt me to use the same special login (*******@privaterelay.appleid.com).
When I tried to reset my password, the app indicated that the email address I used (*******@privaterelay.appleid.com) was invalid.
I checked my forwarded emails to the valid address, but there was nothing sent there either.
In my experience, using this special email address prevents me from filling forms and using it as a genuine email address. I'm sharing this in case others encounter the same issue.
NB: this issue has been ongoing for at least three years.
iPhone 15 Pro Max