There is a procedure to follow in order to enter the Comoros. To my knowledge, there is no visa waiver programme. You need to apply for a visa to the Comoros if you plan on visiting the country. Since they are online [verifiable] platforms, this shouldn't be too much of a hassle. This could be accomplished instantly or on.
Some websites state that a consular visa is not required to enter the Republic of Comoros. Others claim that applying for a visa to the Comoros is impossible unless you plan to visit the country, in which case your only option is to apply for a visa upon your arrival.