Usually, a report will be suspended because Checkr, or the company you applied to, has requested information or documentation from you to proceed and has not yet received it. The best way to see if Checkr needs any information or documentation from you would be to log into the Candidate Portal.
If there is an outstanding request for information or documentation, there will be an upload link in the Candidate Portal for you to use. Please note that some companies may require you to upload documentation directly with them, so you will want to contact the company you applied to.