Panelists are concerned that states may not have had the prescriptive guidance needed to maximize funding.
Signatories say the FCC's map is inaccurate and local governments don't have the resources to challenge it in time.
The second map submission window opens January 3 and closes March 1.
The playbook was discussed in a webinar Friday afternoon.
The Commerce agency will hold pre-funding technical assistance hearings for infrastructure bill money starting this month.