Anyconnect Split Tunnel Teams - "Failed to Send"

Hey all,

Bit of a long shot but i was wondering if anyone has experienced the "failed to send" error on teams when split tunnelling on anyconnect? (or any vpn client). We are seeing a very small number of users experience this whilst the bulk of the organisation working with no issue.

We've split using their recommended approach using IP blocks and specific domains which ive listed below:

access-list split-tunnel-ips standard permit 13.107.64.0 255.255.192.0 access-list split-tunnel-ips standard permit 52.112.0.0 255.252.0.0 access-list split-tunnel-ips standard permit 52.120.0.0 255.252.0.0 anyconnect-custom-data dynamic-split-exclude-domains teams_traffic lync.com, teams.microsoft.com, broadcast.skype.com 

This is then applied and taking effect correctly.

Thanks in advance.