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Trend Micro is not compatible with SEB presently. There is no current fix.
Workaround: pause/disable Trend Micro Maximum Protection, take your test with SEB, and afterwards reactivate Trend Micro Maximum Protection.
Trend Micro Maximum Protection, even on 17.8 (latest version) can cause Safe Exam Browser (SEB) to show one of the following error messages.
You can only run one instance of SEB at a time
Automatic Termination Failed
Microsoft Teams (ms-teams.exe) application is not allowed, but SEB is prevented from terminating it automatically, because security software attached itself
Trend Micro Password Manager
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If you rely on this password manager you'll need to reach out to Trend Micro support for a solution.