Usually a stale carrier settings bundle. Two things to try:

  1. Check for carrier update: Settings → General → About → wait 10 seconds for the prompt. If one appears, install it.
  2. Reset network settings: Settings → General → Transfer or Reset iPhone → Reset → Reset Network Settings. eSIM profiles survive this reset.

Still stuck?

Reach Openline support 24/7 through any of these channels:

When you write in, include your purchase code (the OL-… code we emailed you) and, if the eSIM is already installed, its ICCID (Settings → Cellular → tap the Openline line). That's enough for us to find your plan and diagnose without back-and-forth.