Hi all i had the same issue and found a sort of temp work around. background - I've had nothing but issues with using the added security code feature and in the past I've had to remove the extra code input step from my security settings to allow me to link my ebay account IOS app's to my paypal/ (the app stupidly doesnt even have a 'send code via SMS' button so its impossible to add the code within the IOS app! it constantly usut demands it... anyway solution - I was recieveing the same error as other after attempting to log in using email and password and then follwing that entering my SMS 6 digit security code via the second add security step page. each time i would be confronted with the redirect loop error. I attempted log ins via my paypal app, my IOS ebay app (ihone and ipad) and my mac chrome and safari browsers. I cleared my cookies but didnt help. I spent hours reading forums and eventurally gave up so made an attempt to contact paypal. I searched for the contact details of paypal and found this link https://www.paypal.com/selfhelp/home Just before i went to actually raise my issue throygh the contact link i noticed that i was actually logged into my account within the above page. (look at th etop right of the page, it will/may show the 'log out' button, whch obviously means your logged in. Next to the log out button is the settings button. click this, go into settings, then into security settings and remove your security key (yes i know, we added this to imrpove safety and security to stop thieves abusing paypals poor security but sadly its the route of most log in issues and has been for over 4 years!) Once the additional security key step was removed i was able to log in fine. (downside is no added security measure....) but at least you can make a payment or access your well earned funds! I then linked my IOS devices back up fine and was able to make my ebay purchase. Anytime the IOS devices drop my log in details/link i always have to remove my added security step, link the devices and then go back into paypal to re add the additional security step. you should be able to re add the security step and access account again. If you then have the issues again post re-adding the security step then i will leave the decision to you whether you remove it permanently
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