@LeoAri is asking about licences, not accounts @alemabrahao so the 90 days may well be relevant. Bear in mind though that you only get 90 days if you are using Per Device Licensing model. If you are using co-termination then the license starts to 'tick' as soon as it is shipped. For PDL; If your device is received after the 90 days you will indeed be consuming licensing time. Bear in mind though that, particularly for large projects, with extended rollouts - and maybe where lead times have been long, in recent times, this is likely to have been covered off in the commercial arrangements of the purchase - you may well have received a degree of discount to cover the gap between license purchase and product receipt. I'd check this with your own procurement team and/or the meraki account team as, if you're in the proecet engineering team (for example), you may well not have been made aware of the commercial arrangements.
BTW - this Q would have been better asked under the "Dashboard & Administration" Topic