Inbox Describe reason for uncertainty in action plan

[maennchen]

Is your feature request related to a problem? Please describe.

Extracted from #488

Describe the solution you'd like

Every time when the system sets a certainty of input_needed or uncertain, it should provide the reason explaining why it is not sure.

For example, if a person was identified solely by his phone number and that phone number is used with multiple people, the system should say that it identified multiple possible matches.

Describe alternatives you've considered

None

Additional context

None

References

• https://app.forecast.it/project/P-205/scoping/T2718