Transcutaneous electrical nerve stimulation (TENS), a non-pharmacological treatment, is safe and effective for movement-evoked pain in individuals with Fibromyalgia (FM). The purpose of our NIH-funded pragmatic clinical trial, Fibromyalgia TENS in PT Study (FM-TIPS), assesses feasibility and effectiveness of adding TENS to usual physical therapy (PT) treatment in individuals with FM. We partnered with 33 sites in 6 healthcare systems, training 150+ Midwest clinicians. Outpatient PT clinic sites are cluster randomized to a TENS or a No-TENS intervention, stratified by system and clinic size. We will recruit ∼600 patients with a primary or secondary diagnosis of FM. We developed comprehensive communication and training procedures to ensure study fidelity and adapted over the course of the study to enhance learning. We will provide an overview and the impact of the pandemic on these procedures. Representatives for each healthcare system, each clinic and the study team were identified for communication and training. Training included initial study introduction, human subjects protection, and study procedures. We used a hybrid approach with written, video, onsite, and virtual instruction. All materials and procedures, for clinician and patient-facing materials, website, videos, equipment use (iPad for screening, TENS units), and clinician procedures for PT visits 1-3, were piloted and reviewed by clinicians from each healthcare system. Additional communication and feedback include weekly enrollment reports, monthly newsletters, relationship building with clinicians, enrollment incentives, and continuing education webinars. The pandemic required creative and evolving solutions to maintain study involvement and recruitment. Barriers for enrollment are screening PT Visit 1, comfort level of clinicians for PT Visits 2 and 3, delays/alterations in training and planning, clinician demands, clinicians/patient illness, and staff shortages in the clinics. Current enrollment, study training and implementation has been affected by COVID-19 and we developed creative methods for training and implementation for FM-TIPS. Grant support from Research supported in this USASP Abstract was supported by National Institutes of Health Heal Initiative Grant UG3/UH3 AR076387-01 and UL1TR002537.