Enforcing a Squash merge on Azure DevOps Pull Request using GitPullRequestCompletionOptions

You could use a policy that enforces this.

If you go to branches in DevOps, select your branch -> policies you can allow only squash merges:

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This should make all pull requests into the branch bound by the policy to be done using squash merge.

Here's how it works for Set auto-complete: enter image description here

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