Error reason: The ARN isn't valid. Failing to construct the correct ARN string of my REST API for my CfnWebACLAssociation function

I can see in the AWS Console that the ARN for the REST endpoints being created in the API Gateway have the pattern:

arn:aws:execute-api:us-east-1:553710216655:2hi1wdf6j2/*/OPTIONS/users/*

and my string construction is like so:

const apiArn = `arn:aws:execute-api:${this.region}:${this.account}:${api.restApiId}/*/*/*`;

I'm using ///* because I want to be able to have multiple endpoints in the API.

Also I'm creating the API using the apigateway.LambdaRestApi(...) function so I know I'm creating a REST API and not an HTTP API.

I've also tried formatArn() with no avail:

const apiArn = this.formatArn({
  service: 'execute-api',
  resource: `${api.restApiId}`,
  resourceName: '*/*/*',
  arnFormat: ArnFormat.SLASH_RESOURCE_NAME,
});