I had the same issue, logging in worked sporadically, but eventually it locked me out of the website, while the app still worked.
The password reset also stopped working - the process seems to work, and even says the password is changed, but you still can't log in after that. A call to Accor support resulted in the answer that this is a known issue, and requires a reset by the IT dept. Here's the catch - it is currently taking up to 10 weeks for the issue to be resolved on a case-by-case basis. In the meantime, you cannot login or make reservations online. You also cannot register for promos or access the private sales.
A HUCA resulted in the same answer. So now I wait, and in the meantime take my business elsewhere.
Last edited by Ubud; Mar 3, 2019 at 11:49 pm
Reason: Typos