Option "email all invitees" causes blank emails being sent

I am having a similar issue with Call Reminder emails, which are coming through with the following;

Title:

When: 16/05/2019 22:00 UTC(+00:00)

Created By:

Yet in my email template I have populated with;

The following Call is due;

Subject: {::future::Calls::name::}

Account: {::future::Calls::accounts::name::}

Opportunity: {::future::Calls::opportunities::name::}

Link: {::href_link::Calls::href_link::}

Best Regards,

Please advise - thank you!

Giles

I am having a similar issue with Call Reminder emails, which are coming through with the following;

Title:

When: 16/05/2019 22:00 UTC(+00:00)

Created By:

Yet in my email template I have populated with;

The following Call is due;

Subject: {::future::Calls::name::}

Account: {::future::Calls::accounts::name::}

Opportunity: {::future::Calls::opportunities::name::}

Link: {::href_link::Calls::href_link::}

Best Regards,

Please advise - thank you!

Giles

I have the similar issue with subscription email templates.

if you have the solution for this help me.

Thanks in Advance..