Errors logged on console during AWS CloudWatch publicly Shared dashboard load

[Lakhan032]

When I tried to access publicly shared dashboard it gives following errors on console during graph load:

Failed to load resource: the server responded with a status of 403 (Forbidden)
POST https://cloudwatch.amazonaws.com/cloudwatch/CloudWatch/data/auth.V4BatchSign/xxxxxxxxxxxxxxxx-yyyyyyyyyyyyyyyy 403(Forbidden)

I just want to load CloudWatch shared dashboard on iframe without any console error.

For that I have updated the IAM role of publicly shared dashboards by granting CloudWatch full read or list access