Rest API Error

I’m getting this error code for the media renamer plugin.

CODE: NO-ROUTE
MESSAGE: The API can't be accessed. Is Rest API enabled?

{"code":"rest_no_route","message":"No route was found matching the URL and request method","data":{"status":404}}

My site is running on a live server but is in maintenance mode. Is that why I’m receiving NO-ROUTE code?

Otherwise, the site is all up to date with php 7.4 and recent wordpress.