There are at least two problems with connecting to an Atlas cluster using Compass version 1.17.0.
1. When attempting to connect to an Atlas cluster (1.12 or later, ie. SRV connection) using Compass 1.17.0, the string in the clipboard is not recognized. Compass does not present the "MongoDB connection string detected" dialog.
2. When using the hostname or "1.11 or earlier" (non-SRV) option, the authentication method is left at "None", which is incorrect for Atlas connections. Note that copying only the SRV connection string into the clipboard causes it to be recognize, but the authentication setting is also "None", so this issue is orthogonal to item #1.
These issues appear to related to recent changes in both Compass and/or the Atlas user interface.