Why, when using onBeforeWrite in a SilverStripe object class to send an email using a template, isn't the template found?

When I try to do the above, I get the error "Warning at framework/view/SSViewer.php line 780: None of these templates can be found in theme 'mytheme'" and the template fails to be loaded.

It seems that when I use:
                  $email->setTemplate("MyTemplate");
It is looking somewhere else for the template and not finding it. I have 5 other cases where emails are being sent successfully, and in all other cases, the code is in a controller rather than a dataobject.

I'm fairly new to SilverStripe, so perhaps I'm putting the code in the wrong place. The underlying requirement is that I need to override the onBeforeWrite function for a dataobject so that it sends an email in some circumstances. Perhaps the email sending could be done from something other than my dataobject?

The permissions of the template in question are the same as all the other templates that work, and I have done a ?flush=all and deleted the silverstripe files from /tmp/...
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Terry WoodsIT GuruAsked:
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Terry WoodsIT GuruAuthor Commented:
Apparently the admin pages don't see the templates within the theme folder, which is odd given the error message specifically mentions the correct theme. I tried putting the templates I needed within the mysite/templates folder but that was going to mean I would need to create 2 copies of 2 sub-templates, which isn't DRY enough for my liking. I did try it but from memory had trouble getting the sub-templates to be found too.

I ended up working around the issue by creating a blank front end page, hidden from the menu, that sends emails when loaded. I'll call it regularly with cron.
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