Issue Summary

If a user has a ":" character in their Atlassian Account ID (e.g. xxxxxx:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx) they won't be able to create a calDav synchronization.

In order to identify your own Account Id, you may open the following URL in the browser, replacing <INSTANCE_NAME>:

https://<INSTANCE_NAME>.atlassian.net/rest/api/3/myself

Steps to Reproduce

1. Log-in with a user that has an AAID in this format xxxxxx:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
2. Follow the steps listed here to try to synchronize the calendar using calDav

Expected Results

The user should be able to create the integration

Actual Results

The user will receive a 400 (bad request) status response:

Or 

A 401 (Unauthorized) status response:

The following errors are registered in the backend logs:

message: [CalDAV] Unable to retrieve a calendar. Path [/users] is invalid

message: [CalDAV] Unable to retrieve a calendar. Path [/users/xxxxxx:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx] is invalid

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available.