Thanks for the info!
I got it working now. Interestingly, the following way “A” works, while “B” does not (I put this into the post in Text Mode):
A:
[plantuml]
Alice -> Bob: Authentication Request
Bob –> Alice: Authentication Response
Alice -> Bob: Another authentication Request
Alice <– Bob: another authentication Response
[/plantuml]
B:
[plantuml]
Alice -> Bob: Authentication Request
Bob –> Alice: Authentication Response
Alice -> Bob: Another authentication Request
Alice <– Bob: another authentication Response
[/plantuml]
Method “A” is working for me for now. Thanks.
Out of interest: Should method “B” also work from your point of view? If so, maybe this is related to another plugin that is running in my installation.