I've owned a Fitbit Blaze since Mar-2017 (replaced my workhorse Surge which I'd had for a couple years). Neither the heart rate monitor or active minutes tracker has worked on my Blaze for weeks (mid September). I'd figured it was a firmware issue (subsequent to recent update) and decided to wait patiently until Fitbit could roll out a fix.
The thing that has prompted me to engage the forum is the recent iOS update. That 11.0.2 killed my Blaze's ability to sync with the Fitbit app on my phone.
I was able to work through the iOS 11.0.2 issue on my own and am now able to sync.
So, now, I'm wanting to address the heart rate/active minutes issue before my warranty expires . . .
Attempted resolutions, to date: repeated soft reboots/hard reboots (via left and lower right buttons and Shutdown from the Settings menu). I'd guess I've made several hundred reboots over the weeks since my Blaze stopped tracking. Further, I've attempted many forced syncs within the iOS Fitbit app on my phone.
Also, I've made sure the strap is not too tight for normal wear and I tighten it up a notch for exercise (ensuring it is a loose-snug two-fingers above my wrist). My exercising consists of brisk walking, treadmill, and elliptical.
Please see attached image for a visual orientation of this issue.
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It's great to see you around @Hindsight2, thanks for troubleshooting this by yourself.
Regarding the heart rate reading, I recommend taking a look at this post, where you will be able to see some things that might be affecting this reading and some tips to improve it. Now about the active minutes, could you please provide me with a screenshot of your information?
Hope to hear from you soon. 
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