You're right of course, but I think the OP is confused. She seems to think that "activating" her MagicBand and "activating" her Dining Plan are the same thing. The MagicBand doesn't need to be activated, but the dining plan does (which, as you said, is done as part of the check-in process).The only time you should have to activate a MB is if you buy one at the park and need to add it to your My Disney Experience account. Otherwise as @DisneyJoe said they should be good to go once you check in.
The fact that you "got the text" means that you had done online check in.On our last trip we rope dropped at 8 am for MK and went straight to the park, got the text that our room was ready at 2, went to our hotel right to our room, we had eaten at noon using our dining plan, we never "Activated anything" we just showed up and went
A word of caution, last summer we went straight to a park, got the text that our room was ready (online check in) and our dining plan wasn't activated. This might not be a common issue because when we went to the front desk the tried twice to fix it. We were at POFQ and eating there so it wasn't a long walk to the front desk. Everyone was very helpful, they let us get our food even though the plan wasn't working and a manager fixed it before we were done eating.
It's more common than you think - so much so that we highly recommend to our travel agency clients that they always check-in at the resort before heading to the parks if they have the dining plan.A word of caution, last summer we went straight to a park, got the text that our room was ready (online check in) and our dining plan wasn't activated. This might not be a common issue because when we went to the front desk the tried twice to fix it. We were at POFQ and eating there so it wasn't a long walk to the front desk. Everyone was very helpful, they let us get our food even though the plan wasn't working and a manager fixed it before we were done eating.
It's more common than you think - so much so that we highly recommend to our travel agency clients that they always check-in at the resort before heading to the parks if they have the dining plan.
Good luck!
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