Was this a first time toon in the anniversary or a toon that completed the anniversary events in full last year? If it is a first time toon, there's an order you're supposed to complete all the events. Speed Force is supposed to be run first and then Centennial. That could be the issue here. If it's not a first time toon, then I don't think it matters (unless you can get the initial mission again in which case the above "you must complete the events in this specific order" applies still).
Nope, not a first time toon. I've done the Centennial Collapse several times in previous years on every character I have. Haven't done Speed Force one on a few though, but I can't remember if this was one that I've previously done it with.
