Unable to roll back from macOS Big Sur Beta to macOS Catalina

Office 2016 keep crashing at first click on their interface

Microsoft Error Reporting log version: 2.0

Error Signature:
Exception: EXCBADINSTRUCTION
ExceptionEnumString: 2
Exception Code: 0x00000001 (0x000060000233d000)
Date/Time: 2020-06-25 09:37:04 +0000
Application Name: Microsoft Outlook
Application Bundle ID: com.microsoft.Outlook
Application Signature: OPIM
Application Bitness: x64
Application Version: 16.16.23.20061500
Crashed Module Name: CoreFoundation
Crashed Module Version: 6.9.0
Crashed Module Offset: 0x00000000000fa36f
Blame Module Name: OlkUIKit
Blame Module Version: 16.16.23.200615
UnsymbolicatedChecksum: 3F920B37EBCD1F3397FFA1E64FE19FF3
Blame Module Offset: 0x00000000000a4af2
StackHash: 49715137ee63e2ea-SB2main
Application LCID: 1036
Extra app info: Reg=en Loc=0x040c
Build Type: SHIP
Crashed thread Stack Pointer: 0x00007ffee4c6c680
Audience: Production
AudienceGroup: Production
AudienceChannel: CC
Crashed thread: 0
uncaught ObjC exception, reason: *** -[NSArrayM insertObject:atIndex:]: object cannot be nil

Last Exception Backtrace:
0 CoreFoundation 0x00007fff29d3b36f exceptionPreprocess + 242
1 libobjc.A.dylib 0x00007fff6873aa56 objcexceptionthrow + 48
2 CoreFoundation 0x00007fff29dec16a -[NSCFString characterAtIndex:].cold.1 + 0
3 CoreFoundation 0x00007fff29dea083 -[NSArrayM insertObject:atIndex:].cold.2 + 0
4 CoreFoundation 0x00007fff29c617a1 -[NSArrayM insertObject:atIndex:] + 1135
5 AccessibilityBundles 0x00007fff3c21f362 -[AXBBundleManager loadRequiredBundlesCheckIsLoaded:] + 328
6 AccessibilityBundles 0x00007fff3c21f4a0 -[AXBBundleManager loadRequiredAXBundlesWithClientToken:] + 144
7 HIServices 0x00007fff27ba65c7 _loadAccessibilityBundlesblockinvoke2 + 38
8 libdispatch.dylib 0x00007fff69915fb7 dispatchclientcallout + 8
9 libdispatch.dylib 0x00007fff6991715b dispatchoncecallout + 20
10 HIServices 0x00007fff27ba2213 loadAccessibilityBundles + 178
11 HIServices 0x00007fff27ba23e9 AXXMIGCopyAttributeValue + 238
12 HIServices 0x00007fff27bc39bb XCopyAttributeValue + 443
13 HIServices 0x00007fff27b830c4 mshMIGPerform + 174
14 CoreFoundation 0x00007fff29cc2119 CFRUNLOOPISCALLINGOUTTOASOURCE1PERFORMFUNCTION + 41
15 CoreFoundation 0x00007fff29cc2057 _CFRunLoopDoSource1 + 562
16 CoreFoundation 0x00007fff29cc0b9b CFRunLoopRun + 2363
17 CoreFoundation 0x00007fff29cbfbea CFRunLoopRunSpecific + 534
18 HIToolbox 0x00007fff286a6dd0 RunCurrentEventLoopInMode + 292
19 HIToolbox 0x00007fff286a6a1f ReceiveNextEventCommon + 283
20 HIToolbox 0x00007fff286a68ec BlockUntilNextEventMatchingListInModeWithFilter + 64
21 AppKit 0x00007fff26bfce2b DPSNextEvent + 877
22 AppKit 0x00007fff26bfb659 -[NSApplication(NSEvent) nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1352
23 AppKit 0x00007fff26ed43ee -[NSApplication doModalLoop:peek:] + 303
24 AppKit 0x00007fff2705cb6c 33-[NSApplication runModalSession:]blockinvoke2 + 69
25 AppKit 0x00007fff2705cb14 _33-[NSApplication runModalSession:]blockinvoke + 78
26 AppKit 0x00007fff26ed29e4 NSTryRunModal + 100
27 AppKit 0x00007fff2705ca0f -[NSApplication runModalSession:] + 128
28 OlkUIKit 0x000000010f503af2 OlkUIKitDemoAppToolbarItemsWithCenteredSearch + 207896
29 OlkUIKit 0x000000010f503a80 OlkUIKitDemoAppToolbarItemsWithCenteredSearch + 207782
30 Microsoft Outlook 0x000000010b22b590 ModernDoFirstRunExperience + 81
31 Microsoft Outlook 0x000000010b22b445 OLFirstRunUtilsShowFirstRunExperience + 70
32 Microsoft Outlook 0x000000010b0aca67 OLMImportTasksFromArchive + 11071
33 Microsoft Outlook 0x000000010b0ac087 OLMImportTasksFromArchive + 8543
34 Foundation 0x00007fff2c6647f9 NSThreadPerformPerform + 204
35 CoreFoundation 0x00007fff29cc1b41 CFRUNLOOPISCALLINGOUTTOASOURCE0PERFORMFUNCTION + 17
36 CoreFoundation 0x00007fff29cc1af0 CFRunLoopDoSource0 + 157
37 CoreFoundation 0x00007fff29cc18cd CFRunLoopDoSources0 + 222
38 CoreFoundation 0x00007fff29cc05da CFRunLoopRun + 890
39 CoreFoundation 0x00007fff29cbfbea CFRunLoopRunSpecific + 534
40 HIToolbox 0x00007fff286a6dd0 RunCurrentEventLoopInMode + 292
41 HIToolbox 0x00007fff286a6bc9 ReceiveNextEventCommon + 709
42 HIToolbox 0x00007fff286a68ec BlockUntilNextEventMatchingListInModeWithFilter + 64
43 AppKit 0x00007fff26bfce2b DPSNextEvent + 877
44 AppKit 0x00007fff26bfb659 -[NSApplication(NSEvent) nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1352
45 AppKit 0x00007fff26bedb4b -[NSApplication run] + 586
46 AppKit 0x00007fff26bc1a58 NSApplicationMain + 790
47 libdyld.dylib 0x00007fff6996cc71 start + 1
48 ??? 0x0000000000000002 0x0 + 2

You will need to recover from your back up. Reboot and press CMD R keys as the computer reboots. This will give you the option to recover from your backup.