On the app itself I say it need not be present. This is not an advertisement for a product, it is a product the customer already has. This was explored many years ago when internet banking was new.
If, however, you do advertise a new product subject to insurance on your app or use a screen-capture of that app in an advertisement, the "Member FDIC" or alternative needs to be there.
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AndyZ CRCM
My opinions are not necessarily my employers.
R+R-R=R+R
Rules and Regs minus Relationships equals Resentment and Rebellion. John Maxwell