codesign wants to access key "access" in your bunch of keys

Hi,

my apps run on the iOSSimulator without problems and used to run on devices as well, but after updating to latest XCode-Version I am getting the above error message when trying to run an app on my iPhone 7. It says :

"codesign wants to access key "access" in your bunch of keys . To allow this enter your password".

... but my apple-Developer-ID-Password doesn't work.

And until updating to latest XCode-Version I never had any problems with codesign when running an app on iPhone device.

Any hints what's going wrong ?

XCode Version 9.1 (9B55)

iOS Version 11.1.2 (15B202)

Latest High Sierra Version, macbook Pro 2015