Does the country provide individual online voter registration/polling assignment checks?

FAQ section in the EMB website:

How and where can I find out whether I am on the electoral roll?
At the latest on the 21st day before the election (September 5, 2021), the municipal authorities will inform those entitled to vote with a notification of the address of the voting room and whether it is barrier-free, the voting time and the number under which they are entered in the electoral roll. If you have not received voting notification by this point, you should contact the local authority immediately.

You also have the opportunity to inspect the electoral roll of your municipality during the general opening times from the 20th to the 16th day before the election (September 6th to 10th, 2021) and to check the correctness and completeness of your entered data .