Unable to grant invoke lambda in MySQL workbench (5.6.mysql_aurora.1.22.2)

Hi,

I am trying to set up a Lambda function invoked by a MySQL db. I have been following the documentation:

https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/AuroraMySQL.Integrating.Lambda.html#AuroraMySQL.Integrating.NativeLambda.lambda_functions

Now I am stuck when I tried to do
GRANT INVOKE LAMBDA ON . TO user@domain-or-ip-address
and MySQL workbench shows error: "INVOKE" is not valid at this position for this server version, expecting an identifier
The engine version is 5.6.mysql_aurora.1.22.2

any help is greatly appreciated
Thanks

Edited by: JackMMI on Oct 13, 2021 10:18 AM

Update:
I was able to GRANT INVOKE LAMBDA in MySQL CLI tool

Edited by: JackMMI on Oct 14, 2021 2:14 PM