ATG discovered the issue on January 27th and had the feature up and running again on the 28th January. ATG said that it was not possible to say exactly how many players who wanted to use the self-exclusion feature during that time were affected, but it estimates this figure to around 100 players.
Swedish Gambling Regulator Fines ATG For Self-Exclusion ErrorAccording to ATG, the issue has been resolved and there are new protocols in place to ensure that this does not happen again.
Swedish Gambling Regulator Fines ATG For Self-Exclusion Error