Creating bulk list memberships with documented limits not working


In the documentation for “lists/members/create_all” (doc: it states that up 100 members can be added to a list at a time. But, for a long time now I’ve never been able to do that. The limit appears to be closer to 20 before the the server will begin responding with Service Unavailable errors (Error Code: 130, HTTP status 503).

Can you advise on the limits? Is this a bug or is the limit indeed not 100 and can the documentation be updates to reflect that? Of course I’d prefer to be able to do 100 at a time as advertised.