Interval training despite fatigue

How can it be that I am still tired and endurance training is recommended, but with Magic buckets an interval training is recommended?

What did the form gradient indicate for that day?
E.g. yellow to blue or red to blue before end-of-day.
Was CL5 the default setting for Magic Buckets?
I believe you said you’re using Base-Build-Peak. What is Focus set to? What phase currently?

The form gradient indicate yellow to blue for that day before end-of-day.

No, I’m currently still using Continuous Improvement, as I’ll be traveling a lot for the next two months and my cycling time will be very irregular. After that, I’ll do XATA Base/Build/Peak.