I have started getting the same grey image in a subscription all of a sudden on a dashbaord that was working last friday without any problem. However from Monday it started with grey images in the subscription and this is still ongoing. However it is not all my subscriptions that are doing it, it is random subscriptions that are causing it.
Any expectation as to what the problem is that is causing it and any possible resolution?
I would recommend to open a support ticket with power bi [if you have power bi pro is free].
back in June 2018, the issue for me was related to a power bi patch they were working on it.... "due to the search engine Phantomjs which needs to be updated and to improve the user experience it will be replaced by Chromium in the month of August." and they provided to me with a tactical solution, but was dealt via the support they provide (https://powerbi.microsoft.com/en-us/support/pro/ and I report an issue, etc. They should contact you straight away).
Add me to the list of people experiencing this issue.
Here is my Dashboard Subscription Email Body (not good!)
Here is the Email Attachment (not good!)
Here is the Dashboard in the PowerBI Service after clicking "Go to the dashboard" button within the email from the first snapshot above.
Any ideas on what might be going wrong? Till this issue is resolved, I can't confidently have consumers subscribing to this dashboard if they are going to receive blank emails.