Also make sure the campaign it is linked to has a name. There is a rarer bug that means even naming the encounter and campaign won't work in certain cases. In that case, you need to contact support and note that it i a bug with the encounter builder.
I can't delete my past combat encouters, it asks me to confirm yet it dosen't do anything.
There is a known issue with trying to delete unnamed encounters. If your encounter doesn't have a name, give it one and try again.
Also make sure the campaign it is linked to has a name. There is a rarer bug that means even naming the encounter and campaign won't work in certain cases. In that case, you need to contact support and note that it i a bug with the encounter builder.
Trying to Decide if DDB is for you? A few helpful threads: A Buyer's Guide to DDB; What I/We Bought and Why; How some DMs use DDB; A Newer Thread on Using DDB to Play
Helpful threads on other topics: Homebrew FAQ by IamSposta; Accessing Content by ConalTheGreat;
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If there is a single “incomplete” PC in the campaign it can cause issues too. The minimum requirement is Race + Class + all 6 ability scores
Creating Epic Boons on DDB
DDB Buyers' Guide
Hardcovers, DDB & You
Content Troubleshooting