Should I report not receiving the housing tax notice for an apartment that has not received demands since 1998, knowing that neighbors receive these notices and pay the tax?

The ruling on informing the responsible authority about errors in tax payment depends on the type of tax: If the tax is permissible (Shariah-compliant), then it is obligatory to report the error. However, if the tax is unlawful (which is often the case in such situations), then it is not obligatory to pay it, nor is it obligatory to report it.