Taking over a phone

[magrim123]

My partner has always had iPhone, but tried to move to android.  She has not done well, so is returning to iPhone.  I now have her Galaxy A50 and have used SmartSwitch to move data/settings/etc from my Galaxy S6.  I am now faced with some problems, because the A50 still thinks it belongs to my partner e.g.: 

1. I have a message from Samsung account stating "To continue using services securely, sign in again".  When I do this, it defaults to my partner's email address.  If I override it and enter my password (the same one as for this account), I receive a message stating "Incorrect ID or password"

2. If I open YouTube, it defaults to my partner's account and doesn't allow me to change.  I can't even uninstall and re-install the app 

3. If I go to contacts, it defaults to my partner's name

There are obviously some default settings somewhere that I have failed to find and change.

Kindly advise what I must do to make this Galaxy A mine and no longer my partner's.

Thanks

[SirJules]

Settings - Accounts & Backup - Accounts. Then change the account email address etc from there to your email and password.

[SirJules]

When in accounts it should list all the accounts the phone is logged into. I.e. Google, Samsung etc.

[magrim123]

thanks