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doc: Add note to migrating from v2 page about dev_id constraints in v3 #26

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doc: Add note to migrating from v2 page about dev_id constraints in v3 #26

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4 changes: 4 additions & 0 deletions doc/content/getting-started/migrating/migrating-from-v2.md
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Expand Up @@ -116,4 +116,8 @@ $ ttn-lw-migrate application --verbose --dry-run --source ttnv2 "my-ttn-app" > a
$ ttn-lw-migrate application --source ttnv2 "my-ttn-app" > all-devices.json
```

{{< note >}} In TTS V3, underscores ( _ ) are not allowed in the end device ID. Using the `ttn-lw-migrate` tool will replace an underscore ( _ ) with a dash ( - ). {{</ note >}}

After exporting the end devices in to a json file you can refer to [Import End Devices Document]({{< ref "getting-started/migrating/import-devices.md" >}}) in {{% tts %}} for next steps.