In March, Microsoft released some CredSSP updates for CVE-2018-0886. These may result in the following error displaying for some clients when trying to use RDP (such as using Remote Apps):
As noted here https://support.microsoft.com/en-us/help/4093492/credssp-updates-for-cve-2018-0886-march-13-2018, the registry key impacted may need to be created and set.
You can set this to two (2), which is the least secure, to resolve the situation and get people back into older RDP servers that were impacted by the change.
I recommend using 1 if 0 (the default) is not working, where possible.
