Re-tested on https://folio-dev-spitfire-2nd-consortium.ci.folio.org/ 
Now we can use only one request to link Local/Shared MARC bibs with Local/Shared MARC authority records.
1) For linking Local MARC bib use "<Member>" x-okapi-tenant header
2) For linking Shared MARC bib use "<Central>" x-okapi-tenant header
See attached screencasts: 

Issue 1 - looks like it fixed, but sometimes request don't return MARC authority records
See attached screencast:

Issue 1 probably will be fixed in the scope of and

According to discussion on sync-up Issue 2 - will be fixed in the scope of **

According to the notes from , the following scenario was re-tested, and it still reproduces:
Issue 2 - "Local linked MARC Bib is not updated after update of Shared MARC authority (which is linked to Shared and Local Instances) from Central tenant"
Expected result:  Linked field in Local "Instance" record is updated according to the updates in Shared linked "MARC authority" record.
Actual result: Linked field in Local "Instance" record is not updated according to updates in Shared linked "MARC authority" record.
See attached screencast:

Note: The same issue reproduces when linked Shared MARC authority was edited on UI in Central/Member tenant.
Steps to reproduce could be found in this test case: https://foliotest.testrail.io/index.php?/cases/view/407641 

Hi  
During testing on https://folio-dev-spitfire-2nd-consortium.ci.folio.org/ following Issue 01 is found: ""500" and "403" errors are returned to POST "/records-editor/links/suggestion" requests for member and central tenants"
Note: Issue reproduces not each try. See details on screencast.
Preconditions:

1) Authorized user has assigned following permissions in Central tenant:

•  

  • Inventory: All permissions

  • MARC Authority: View MARC authority record

• User has assigned following permissions in Member 1 tenant:

•  

  • Inventory: All permissions

  • MARC Authority: View MARC authority record

  • quickMARC: View, edit MARC bibliographic record

  • quickMARC: Can Link/unlink authority records to bib records

2) Member 1 tenant has local "MARC bibliographic" record (

) with "$0" value corresponding to imported shared "MARC Authority"'s (

) naturalId in a linkable field.

Steps:
1. Log in into Member 1 tenant of https://folio-dev-spitfire-2nd-consortium.ci.folio.org/  as user from preconditions.
2. User is on the detail view pane of local "Instance" record opened in the "Inventory" app, ex. of search query: "C405922 Instance Local M1"
3. Click on the "Actions" at the third pane >> Select "Edit MARC bibliographic record" option.
4. Click on the "Link headings" button in the upper right corner of the pane
Expected result: Field eligible for linking with subfield "$0" was linked to "MARC authority" record from the Preconditions, e.g. "100" field is linked.
Actual result: 
On UI: Error toast notification is displayed
DevTools:
1) POST  "/records-editor/links/suggestion" for College tenant is returned with "500" error and following message:

2) POST  "/records-editor/links/suggestion" for consortium tenant is returned with "403" error and following message: "Access for user 'northc1' (d4b48727-1e98-4c55-9c28-180e8ee801a2) requires permission: marc-records-editor.links.suggestion.post"

See attached screencast:

QA note:
1) The whole story UIPFAUTH-76 should be retested in scope of current issue.
2) Scenario from MODDATAIMP-901
should be re-tested in scope of current issue:

• Update of Shared MARC authority that is linked to instances from central tenant - the user should be able to update shared authorities from the central tenant that are linked to local records