Showup reads every calendar on your iPhone. Add the account in Settings → Calendar → Accounts, then reopen Showup.
Allow Alarms for Showup in Settings → Showup. Without it, Showup falls back to a time-sensitive notification, which Focus and silent mode can hide.
Turn off "Phone calls" in Showup Settings, or set a meeting to Gentle or Silent.
Settings → Account → Delete account in the app.
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