"Unsupported service account" errors from gcloud when deploying --gen2 functions with --build-service-account

gcloud --version
Google Cloud SDK 488.0.0
alpha 2024.08.09
beta 2024.08.09
bq 2.1.8
core 2024.08.09
gcloud-crc32c 1.0.0
gsutil 5.30
istioctl 1.20.47

I'm at a loss for how to execute the gcloud functions deploy --gen2 command. I can deploy gen1, but gen2 throws indecipherable service account errors.

First going right from the docs: https://cloud.google.com/functions/docs/deploy#basics

gcloud functions deploy sdfsdfsd \
    --gen2 \
    --project="sdfsdf" \
    --region="us-central1" \
    --entry-point=my_func \
    --no-allow-unauthenticated \
    --runtime=python312 \
    --build-service-account="my-cloud-build-acct@my-project-id.iam.gserviceaccount.com" \
    --trigger-http

I get ERROR: (gcloud.functions.deploy) OperationError: code=3, message=Deployment failed: ["params.service_account: must be empty or a service account of format: projects/{PROJECT_ID}/serviceAccounts/{ACCOUNT}"]. Check your build configuration. Already makes no sense because I'm not setting the service account.

Then I set the account with: --service-account="myacct@my-project-id.iam.gserviceaccount.com" and I get ERROR: (gcloud.functions.deploy) Deployment failed: ["params.service_account: must be empty or a service account of format: projects/{PROJECT_ID}/serviceAccounts/{ACCOUNT}"]. Check your build configuration..

I can't find any examples of the gcloud cli using this format, but when I try it I get this error: ERROR: (gcloud.functions.deploy) ResponseError: status=[400], code=[Ok], message=[Could not create Cloud Run service sdfsdfsd. serviceAccountName: Unsupported service account: projects/my-project-id/serviceAccounts/myacct@my-project-id.iam.gserviceaccount.com]

I gave the myacct@my-project-id.iam.gserviceaccount.com account the following roles:

What do I have to do to get this command to work?

I can deploy gen2 functions through the UI with this service account without issues.

The answer had nothing to do with the --service-account param even though whenever I modified its format I got DIFFERENT ERRORS!

I left this off initially (edited my post to include it), but I'm using a custom build service account (default is disabled now for security reasons).

It seems this is the correct series of switches:

--build-service-account="projects/{PROJECT_ID}/serviceAccounts/{CLOUD_BUILD_GSA}" \
--service-account="{RUNTIME_GSA}" \

It does mention this format in the docs: https://cloud.google.com/sdk/gcloud/reference/functions/deploy#--build-service-account

But the fact that the errors changed in response to modifying the other switch was very confusing. I would open a bug report, but not sure how it would be worded. params.service_account should have been params.build_service_account in the errors.