The legacy version of NemID is experiencing issues (this is the version where the recipient can select between signing with CPR or CVR). We are investigating to find a fix for this as soon as possible. Meanwhile it is possible to work around this by changing authentication method to NemID CPR, NemID CVR or NemID PID. This can be done via the API or for an ongoing journey in the e-archive by opening the document and clicking on the affected party > Authentication to sign > Change.
The issue is now resolved, pardon any inconvenience.