Mythic Grand Masters Training Tier III not available

Product: Star Wars: Galaxy of Heroes
Platform:Android Phone
What type of device are you experiencing the issue with? Google Pixel XL
OS Version Android 10
Ally Code: (Find it here: http://bit.ly/AllyCode ) 514-166-861
What type of issue do you have? Gameplay
How often does the bug occur? Every time (100%)
Summarize your bug In Mythic Grand Masters Training, I simmed Tier I and played and completed Tier II. Tier III is unavailable for me to complete. It does not seem to be a Victory / Action count issue - the count does not seem to be shared in this event. I have the same issue whether I use my Android phone (Google Pixel XL) or my iPad (IOS).
Steps: How can we find the bug ourselves? You can see my screenshots attached.
Connection Type Wifi
Please select your region North America
Country USA

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I'm attaching two screenshots - one showing that tier III is green (because I haven't played it yet) but is not available for me to select without paying crystals for the pleasure. The other shows the info for the event - there is not mention of victory / action count being shared amongst the tiers.