Do you have two boards also? One for each project?
Sounds like you don't have the permission in project B to start a sprint. As you can see here:
you need admin permission in project B to start a sprint in Jira 6.7
By projects, I assume you mean boards, right ?
Because in JIRA, projects are the biggest entities and are independant, so this kind of problem should not exist.
If you actually have two different projects, then I don't know how to help you with that.
You have to make sure that the boards don't share the same backlog. More important, the sprints you're trying to start must not contain the same issues. If there is just one issue in common, then you won't be able to start both of the sprints.
The best way to prevent this is to apply a Filter on both of the boards to make sure thay won't have the same backlog.
no, not the URL - we can't look here into your Boards, we are not Atlassian stuff, just users as you.
Please provide us the filter query:
Should be a JQL-Query.
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