Moving / upgrading old project, FMOD can't find resources

Heya I’ve got an old project that I’m working on with a new computer and trying to upgrade. I had it in Unity 2019 / FMod 1.7.3 up to Unity 2021.3. When I run the project I get a bunch of errors about not being able to find the sound files:

FMOD Error (ERR_EVENT_NOTFOUND): The requested event, bus or vca could not be found.
Event retrieval failed: {92c9f524-4aad-4135-98b7-37780cd192d9}

But if I click on the object producing the error then I can click on the related FMOD Asset in the FMOD Studio Event Emitter component and hit Play and the sound plays. The banks are in Streaming Assets.

It’s been many years since I’ve used FMOD, would appreciate any help getting this working.

Did you update the version of FMOD for Unity and FMOD Studio you’re using, or just the version of Unity?

If you updated the version of the FMOD for Unity plugin installed in your Unity project, did you do so using the method described in our documentation on the topic?

If you installed a new version of FMOD Studio, did you rebuild your banks to ensure the bank files in your game were built by the new FMOD Studio version?

I did not upgrade the version of FMOD, just Unity so far. Do I need to also upgrade FMOD? I’m not positive I have the right project files to rebuild the banks.

No, but you do need to upgrade the version of FMOD for Unity that you’re using.

Each version of FMOD for Unity allows content created in specific versions of FMOD Studio to work in specific versions of Unity; if you attempt to use it with a different version of FMOD Studio or a different version of Unity, it is unlikely to work correctly. (We are unable to design versions of FMOD for Unity that work correctly with all future versions of Unity because we cannot predict how Unity will change in the future.)

You have updated your version of Unity; therefore, you must update your version of FMOD for Unity to match.

You shouldn’t need to update the version of FMOD Studio that you are using, as the FMOD Engine is backwards compatible with banks built in older versions. However, as new features introduced in newer FMOD Engine versions may involve changes in behavior, we strongly recommend you test thoroughly before releasing the updated version of your game.