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Can you share the code for your lambda function resource? For reference, this works and creates a function with 5000MB of memory:

const fn = new aws.lambda.Function("fn", {
    code: new pulumi.asset.AssetArchive({
        ".": new pulumi.asset.FileArchive("./app")
    }),
    role: role.arn,
    handler: "index.handler",
    memorySize: 5000,
    runtime: aws.lambda.Runtime.NodeJS18dX
})

hm i did the exact same thing as you did

Can you copy/paste the entire error message?

this is the error nessage i got - configuration : ValidationException: status code: 400