Unable to authorize using PKCE

[TheZorkij]

The Code Verifier sent by the app in the token request does not produce a valid Code Challenge. Here is both:
Code Verifier:
/0T2nBJfBvLbytrymN6TVBNmupxqUEYd4oSJO11MYH9FwZsmE0WUwXHU5oVOwq8QbPZAl1S0vJp9FmCWSYPJmaoI3J8762QkXB+dRywfMFCYG5e1+wFpEYB6W2q7xC6O

Code Challenge from the authorization request:
jFtUhY/me1ri0Y5qAMJN7TbBpkpTKqSmbabxzkxO3 k=

RFC7636 says that a Code Verifier must only contain unreserved characters [A-Z] / [a-z] / [0-9] / "-" / "." / "_" / "~" but this one contains '+' and '/' which can't be right?

[vlad-ignatov]

Correct, a fix is coming soon...

[vlad-ignatov]

Should be fixed in fhirclient@2.5.2. Please re-open if you have further issues.