token.getAccessTokenPayload is not a function

After login, using the asp.net core 3.0 application. Not sure how to fix this.
` getRole(): Observable {
return this.authService.onTokenChange()
.pipe(
map((token: any) => {
const payload = token.getAccessTokenPayload();
return !!(token.isValid() && payload && payload['role']) ? this.getLowerCaseRoles(payload['role']) : 'user';
}),
);
}``
`core.js:6014 ERROR TypeError: token.getAccessTokenPayload is not a function`
using JWT tokens

**Current behavior:**

core.js:6014 ERROR TypeError: token.getAccessTokenPayload is not a function
**Expected behavior:**