July 2022 - last edited July 2022
As is the case for several other people here, I have this issue and can't DM to fix it, so I'm just posting here to [a] confirm that this is still an active issue and [b] hopefully get my account DM permissions enabled.
I am also having this issue, and I think the only way to fix it might be to install Sims 3 and click somewhere on the launcher to reset the password.
I tried contacting EA Chat support but they were unable to resolve and forwarded the issue to the forum team.
When I try to log in to the sims forums, I log in with my EA account. It then takes me to a page that tells me I already have a username and asks me for a password. I have tried putting in my EA password but it doesn't work. If I previously set a password I don't know what it is anymore, and I can't see an option to reset my password.