Google Play Protect now enforces an allowlist of approved Device Policy Controllers (DPCs) during provisioning. If your DPC isn’t on the list, Play Protect can flag it as “Harmful app blocked” even when it’s legitimate.
Before you appeal:
Then submit an appeal using Google’s DPC allowlist form (linked from the Play Protect warning/help article). Explain the business use case, the permissions you request, and how users are informed. While waiting, advise users/admins that the warning is about allowlisting, not malware, and that the “continue” option may appear if permitted in your flow.
Read more on this can be read in the full article: The DPC allowlist.