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Fitbit Sense 2 and MFP is not syncing

Hi guys
I have purchased my Fitbit sense 2 and have connected everything with MFP. It has worked well except on 30/12/24 and now today. I just cannot get any data from Fitbit to MFP. I have tried logging in and out from both, force sync, delete both apps and reinstall. Nothing seems to work. In December MFP did not have a whole days data recorded from Fitbit but the next day it just started to work again. Today it hasn't worked all day so far. Again I tried all the fixes as previously but still does not work.

My question is on the days that the two apps don't sync can I manually input my calories into MFP. For example can I just go to the Exercise tab and say I walked and put the total number of calories shown in Fitbit for the day. Will this then be adjusted by MFP appropriately. Or is there a formula for how much of the total daily calories I can input into MFP to compensate whatever calculation happens when data is sent from Fitbit to MFP. It is quite demoralising when you get all hyped up and tracking your progress and then you have gaps every week or two.