4XX issues are the Http status codes which ranges from 400 to 499 among whom 404, 403, 401 are very common, the problem originated is at the client end in which either the browser or the application request, the meaning of the error is that the request by the client may be either malformed, unauthorized or it wants to say that the source request is unavailable, this is just a small paragraph on "Blocked due to other 4xx issue" for Google search console,to know about the possible solutions visit. https://www.algosaga.com/blog/blocked-due-to-other-4xx-issue/