There is a number of employees at our company who don't have a Jira-account but still need to have access to our helpdesk. So we tried to add them as customers, using their company e-mail adress like this:

Unfortunately that doesn't seem to work. Jira says that the customers couldn't be added and that we should check the adress and try again. We tried several different adresses. About a week ago, a test-account was successfully added as customer so it seems to be a random, temporal occurance, however now persisting for almost 24h.
